My husband and I just decided to to start trying for a baby in December

My husband and I just decided to to start trying for a baby in December. We expected it to take several months of trying. So we were pretty confused when I started having implantation spotting the 2nd week in January...What was this bleeding?!? Then I started having this weird pulling sensation in my lower stomach. So I took a test 3 days before my period was set to start and I thought I saw a positive line, but it was so faint I couldn't trust my eyes. So I waited 2 more days and took a digital test and it was POSITIVE!! we are thrilled and SHOCKED!